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Share Based Compensation - Summary of Performance Criteria (Detail) - SEK (kr) kr in Billions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Weight | 100.00% | 100.00% | 100.00% | 100.00%
Achieved Vesting Level |  |  | 92.72% | 100.00%
Bottom of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Vesting Opportunity | 0.00% | 0.00% | 0.00% | 0.00%
Top of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Vesting Opportunity | 200.00% | 200.00% | 200.00% | 200.00%
2024 Group operating income [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Criteria | Range (SEK billion): 16.7 -30.7 |  |  |
Weight | 45.00% |  |  |
Achievement, value | kr 26.0 |  |  |
Achieved Vesting Level | 132.82% |  |  |
2024 Group operating income [member] | Bottom of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period | Jan 1, 2024 |  |  |
Vesting Opportunity | 0.00% |  |  |
2024 Group operating income [member] | Top of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period | Dec 31, 2024 |  |  |
Vesting Opportunity | 200.00% |  |  |
2023 Group operating income [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Criteria |  | Range (SEK billion): 26.4 -40.4 |  |
Weight |  | 45.00% |  |
Achievement, value |  | kr 21.4 |  |
Achieved Vesting Level |  | 0.00% |  |
2023 Group operating income [member] | Bottom of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period |  | Jan 1, 2023 |  |
Vesting Opportunity |  | 0.00% |  |
2023 Group operating income [member] | Top of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period |  | Dec 31, 2023 |  |
Vesting Opportunity |  | 200.00% |  |
2022 Group operating income [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Criteria |  |  | Range (SEK billion): 24.1–34.1 |
Weight |  |  | 45.00% |
Achievement, value |  |  | kr 32.2 |
Achieved Vesting Level |  |  | 162.76% |
2022 Group operating income [member] | Bottom of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period |  |  | Jan 1, 2022 |
Vesting Opportunity |  |  | 0.00% |
2022 Group operating income [member] | Top of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period |  |  | Dec 31, 2022 |
Vesting Opportunity |  |  | 200.00% |
2021 Group operating income [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Criteria |  |  |  | Range (SEK billion): 15.0–24.0
Weight |  |  |  | 50.00%
Achievement, value |  |  |  | kr 27.4
Achieved Vesting Level |  |  |  | 200.00%
2021 Group operating income [member] | Bottom of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period |  |  |  | Jan 1, 2021
Vesting Opportunity |  |  |  | 0.00%
2021 Group operating income [member] | Top of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period |  |  |  | Dec 31, 2021
Vesting Opportunity |  |  |  | 200.00%
Absolute TSR [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Criteria | Range: 6%–14% | Range: 6%-14% | Range: 6%-14% | Range: 6%–14%
Weight | 25.00% | 25.00% | 25.00% | 30.00%
Achieved Vesting Level |  |  | 0.00% | 0.00%
Achievement, percentage |  |  | 0.54% | (16.17%)
Absolute TSR [member] | Bottom of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period | Jan 1, 2024 | Jan 1, 2023 | Jan 1, 2022 | Jan 1, 2021
Vesting Opportunity | 0.00% | 0.00% | 0.00% | 0.00%
Absolute TSR [member] | Top of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period | Dec 31, 2026 | Dec 31, 2025 | Dec 31, 2024 | Dec 31, 2023
Vesting Opportunity | 200.00% | 200.00% | 200.00% | 200.00%
Relative TSR [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Criteria | Ranking of Ericsson: 6–2 | Ranking of Ericsson: 6–2 | Ranking of Ericsson: 6–2 | Ranking of Ericsson: 6–2
Weight | 20.00% | 20.00% | 20.00% | 20.00%
Achieved Vesting Level |  |  | 0.00% | 0.00%
Achievement, description |  |  | 10 out of 12 | 12 out of 11
Relative TSR [member] | Bottom of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period | Jan 1, 2024 | Jan 1, 2023 | Jan 1, 2022 | Jan 1, 2021
Vesting Opportunity | 0.00% | 0.00% | 0.00% | 0.00%
Relative TSR [member] | Top of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period | Dec 31, 2026 | Dec 31, 2025 | Dec 31, 2024 | Dec 31, 2023
Vesting Opportunity | 200.00% | 200.00% | 200.00% | 200.00%
CO2e emissions (ktonnes) 138114 [Member] | Group Environmental, Social and Governance [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Criteria | CO2e emissions (ktonnes): 138–114 |  |  |
Weight | 1.66% |  |  |
Achieved Vesting Level | 200.00% |  |  |
CO2e emissions (ktonnes) 138114 [Member] | Group Environmental, Social and Governance [member] | Bottom of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period | Jan 1, 2024 |  |  |
Vesting Opportunity | 0.00% |  |  |
CO2e emissions (ktonnes) 138114 [Member] | Group Environmental, Social and Governance [member] | Top of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period | Dec 31, 2024 |  |  |
Vesting Opportunity | 200.00% |  |  |
CO2e emissions (ktonnes) 133110 [Member] | Group Environmental, Social and Governance [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Criteria | CO2e emissions (ktonnes): 133–110 |  |  |
Weight | 1.66% |  |  |
CO2e emissions (ktonnes) 133110 [Member] | Group Environmental, Social and Governance [member] | Bottom of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period | Jan 1, 2025 |  |  |
Vesting Opportunity | 0.00% |  |  |
CO2e emissions (ktonnes) 133110 [Member] | Group Environmental, Social and Governance [member] | Top of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period | Dec 31, 2025 |  |  |
Vesting Opportunity | 200.00% |  |  |
CO2e emissions (ktonnes) 126102 [Member] | Group Environmental, Social and Governance [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Criteria | CO2e emissions (ktonnes): 126–102 |  |  |
Weight | 1.68% |  |  |
CO2e emissions (ktonnes) 126102 [Member] | Group Environmental, Social and Governance [member] | Bottom of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period | Jan 1, 2026 |  |  |
Vesting Opportunity | 0.00% |  |  |
CO2e emissions (ktonnes) 126102 [Member] | Group Environmental, Social and Governance [member] | Top of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period | Dec 31, 2026 |  |  |
Vesting Opportunity | 200.00% |  |  |
Increasing the representation of women leaders in the Group Range 2527 [Member] | Group Environmental, Social and Governance [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Criteria | Increasing the representation of women leaders in the Group: Range 25%–27% |  |  |
Weight | 5.00% |  |  |
Increasing the representation of women leaders in the Group Range 2527 [Member] | Group Environmental, Social and Governance [member] | Bottom of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period | Jan 1, 2024 |  |  |
Vesting Opportunity | 0.00% |  |  |
Increasing the representation of women leaders in the Group Range 2527 [Member] | Group Environmental, Social and Governance [member] | Top of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period | Dec 31, 2026 |  |  |
Vesting Opportunity | 200.00% |  |  |
CO2e emissions (ktonnes) 142121 [member] | Group Environmental, Social and Governance [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Criteria |  | CO2e emissions (ktonnes): 142–121 |  |
Weight |  | 1.66% |  |
Achieved Vesting Level |  | 193.72% |  |
CO2e emissions (ktonnes) 142121 [member] | Group Environmental, Social and Governance [member] | Bottom of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period |  | Jan 1, 2023 |  |
Vesting Opportunity |  | 0.00% |  |
CO2e emissions (ktonnes) 142121 [member] | Group Environmental, Social and Governance [member] | Top of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period |  | Dec 31, 2023 |  |
Vesting Opportunity |  | 200.00% |  |
CO2e emissions (ktonnes) 132113 [member] | Group Environmental, Social and Governance [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Criteria |  | CO2e emissions (ktonnes): 132–113 |  |
Weight |  | 1.66% |  |
Achieved Vesting Level |  | 200.00% |  |
CO2e emissions (ktonnes) 132113 [member] | Group Environmental, Social and Governance [member] | Bottom of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period |  | Jan 1, 2024 |  |
Vesting Opportunity |  | 0.00% |  |
CO2e emissions (ktonnes) 132113 [member] | Group Environmental, Social and Governance [member] | Top of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period |  | Dec 31, 2024 |  |
Vesting Opportunity |  | 200.00% |  |
CO2e emissions (ktonnes) 122104 [member] | Group Environmental, Social and Governance [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Criteria |  | CO2e emissions (ktonnes): 122–104 |  |
Weight |  | 1.68% |  |
CO2e emissions (ktonnes) 122104 [member] | Group Environmental, Social and Governance [member] | Bottom of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period |  | Jan 1, 2025 |  |
Vesting Opportunity |  | 0.00% |  |
CO2e emissions (ktonnes) 122104 [member] | Group Environmental, Social and Governance [member] | Top of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period |  | Dec 31, 2025 |  |
Vesting Opportunity |  | 200.00% |  |
Increasing the representation of women leaders in the Ericsson Group Range 23-25 [Member] | Group Environmental, Social and Governance [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Criteria |  | Increasing the representation of women leaders in the Group: Range 23%–25% |  |
Weight |  | 5.00% |  |
Increasing the representation of women leaders in the Ericsson Group Range 23-25 [Member] | Group Environmental, Social and Governance [member] | Bottom of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period |  | Jan 1, 2023 |  |
Vesting Opportunity |  | 0.00% |  |
Increasing the representation of women leaders in the Ericsson Group Range 23-25 [Member] | Group Environmental, Social and Governance [member] | Top of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period |  | Dec 31, 2025 |  |
Vesting Opportunity |  | 200.00% |  |
CO2e emissions (ktonnes) 265200 [member] | Group Environmental, Social and Governance [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Criteria |  |  | CO2e emissions (ktonnes): 265–200 |
Weight |  |  | 5.00% |
Achieved Vesting Level |  |  | 189.52% |
CO2e emissions (ktonnes) 265200 [member] | Group Environmental, Social and Governance [member] | Bottom of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period |  |  | Jan 1, 2022 |
Vesting Opportunity |  |  | 0.00% |
CO2e emissions (ktonnes) 265200 [member] | Group Environmental, Social and Governance [member] | Top of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period |  |  | Dec 31, 2024 |
Vesting Opportunity |  |  | 200.00% |
Increasing the representation of women leaders in the Ericsson Group Range 22-24 [member] | Group Environmental, Social and Governance [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Criteria |  |  | Increasing the representation of women leaders in the Group: Range 22%–24% |
Weight |  |  | 5.00% |
Achieved Vesting Level |  |  | 200.00% |
Achievement, percentage |  |  | 24.15% |
Increasing the representation of women leaders in the Ericsson Group Range 22-24 [member] | Group Environmental, Social and Governance [member] | Bottom of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period |  |  | Jan 1, 2022 |
Vesting Opportunity |  |  | 0.00% |
Increasing the representation of women leaders in the Ericsson Group Range 22-24 [member] | Group Environmental, Social and Governance [member] | Top of range [Member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period |  |  | Dec 31, 2024 |
Vesting Opportunity |  |  | 200.00% |

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